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第 9 章 Using canonicalized DNS host names in IdM

DNS canonicalization is disabled by default on Identity Management (IdM) clients to avoid potential security risks. For example, if an attacker controls the DNS server and a host in the domain, the attacker can cause the short host name, such as demo, to resolve to a compromised host, such as malicious.example.com. In this case, the user connects to a different server than expected.

This procedure describes how to use canonicalized host names on IdM clients.

9.1. Adding an alias to a host principal
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By default, Identity Management (IdM) clients enrolled by using the ipa-client-install command do not allow to use short host names in service principals. For example, users can use only host/demo.example.com@EXAMPLE.COM instead of host/demo@EXAMPLE.COM when accessing a service.

Follow this procedure to add an alias to a Kerberos principal. Note that you can alternatively enable canonicalization of host names in the /etc/krb5.conf file. For details, see Enabling canonicalization of host names in service principals on clients.

Prerequisites

  • The IdM client is installed.
  • The host name is unique in the network.

Procedure

  1. Authenticate to IdM as the admin user: 

    $ kinit admin

  2. Add the alias to the host principal. For example, to add the demo alias to the demo.examle.com host principal: 

    $ ipa host-add-principal demo.example.com --principal=demo
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